Improved book-dbillins machine



im mit @anni @frita QSTILLM'AN W. ROBINSON AND DE vOLsON WOOD, OFANN Anson; l e y MIOHIGAN., v l Letters Patent No. 71,329, dated November-26, 1867.

IMPhovBD RocK-DnILLINeMAoHINE.

` Be it known that we, STILLMAN W.I ROBINSON and Dn VoLsoN Wooinof Ann Arbor,- county of Washtlenaw, and State ofMichigan, have invented a new and useful Machine for Drilling Rock; `and we do hereby declare thatthe following is a full, clear, and exact description of the construction and operation ofthe same," so that l others skilled in the` art may be able to make and use it, reference being had to the annexed drawings, making` p a part of this specification, in which- Figurel is a perspective view of the machine.

Figure is a longitudinal section through the centre of the cylinder, the piston-rod,'ond valve.: The nature and main feature of our invention' consist in reciprocating the cylinder instead of the'piston, and of attaching the drill or drill-holder directly to the cylinder, ora prolongation fremit, to cause the `drill t l reciprocate from and to the rock, and strike it `by the direct action of the motor upon the cylinder-heads.` l Th .machine may be used as a pounder to strike the drill, thus avoiding the necessity ef reciprocating the latter. i

The object of this invention is to enable us to make a lighter and stronger niachine` of less number of pieces and less number of packing-joints than can be done in ,machines heretofore made; also the cylinder, being plain` and without passages, may easily he made of steel, thereby making itmore durable, all `of which are objects of j i vital importance in machines of this class` In the figures, A A are the cylinder, its forwalid head, and the prolongation to which the drill ordrill-holder` is attached. `These may consist .of one or more pieces, as convenience may require. C is the lrearcylinder-` head, `.which serves also for rotation, as will hereafter he explained. It is kept screwed into thewend of the cylinder by the operation of rotating. B B are thepiston and piston-rod, which pass through the hub D, and are i secured firmly to it. The motor is admitted to and from the ends of the cylinder through the piston-fred, con` i tainingthe passages b and c. The valve F', in the chest I, which regulates the admission of the `motor to the `1 cylinder, `is operated by the tappet.C in any convenient manner. i p

1 When'the motor is admitted to the rear'end of the cylinder, and exhausted from the forward end,.it` presses against thexrear head'C, and forces the cylinder` and all attached back from the rock untilthe tappet (l. 4acting upon the valve-gear, reverses the valve. The action of the motor is then reversed, and presses upon the forward end of the cylinder, and forces it forward, and causes the drill to strike the rock by thedirect action of the ,3 i motor upon thefend of the cylinder. f

Rotation is effected by a long clic-k, L, which rotates about one edge as an axis, the other edge ofhwhich` is spiral, (or, more correctly, helicoidal,) and is pressed against the ratchet C by the spring a.` A ratchet, C,.is formed on the circumference of the cylinder-head, the teeth of which,di1ring the back stroke, ,coming in'con` i tact with the spiral edge of the click, cause a partial rotation of the head, cylinder, and tool. By this process* the `cylinder-heid iskept screwed into its proper place. During the advance stroke, there being no rotatie the click will fall into the next tooth. A i. The `engine is fed progressively towards the rock in `any suitable manner, one method ofuwhich we have d l made the subject of a special application of even date. i What we claim as new, and desire to `secure hy Letters Patent, isp In rock-drilling machines in whichtlie `drill has a rotary or feed movement, or both, the construction and tool, and, at thesame time, 'constitute one of the cylinderheads to receive the direct action of the motor, which I `thus produces the operation of drilling rock, zc., in the manner and for the purpose herein described.

` Also, the click L, in combination with the ratchet C, (the latter forming the cylindcrhead,) inthemanner l and` for the purposes herein described.

-. STILLMAN W. ROBINSON i DE VOLSON WOOD.

Witnesses: l l

\ F. F. W-Itoox,

jarrangement of the cylinder so that its prolonged end may serve as a holder for the drill-rod, Orfor driving the .i 

